# AD 70-10-01: Instrument Panel Circuit Boards

- Type: Airworthiness directive
- Status: Current
- Products: Textron 99, 99A, 99A (FACH), A99, A99A, B99 and C99
- Effective: June 3, 1971
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-1222
- Registered aircraft: 95 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EE9B2AF5B58F931286256E01005AC5DE.0001
- DRS record last changed: January 21, 2026
- Page: https://openairdocs.org/ad/70-10-01

## The airworthiness directive

70-10-01 BEECH: Amdt. 39-986 as amended by Amendment 39-1222. Applies to all 99 Series Airplanes (Serial Numbers U-1 through U-114).

Compliance: Required as indicated, unless already accomplished.

To prevent a fire hazard, accomplish the following:

Within the next 50 hours' time in service after the effective date of the AD, modify the printed circuit boards in the edge lighted instrument panels in accordance with either Beechcraft Service Instruction No. 0203-351 or any other method approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, Central Region.

Amendment 39-986 became effective May 12, 1970.

This Amendment 39-1222 becomes effective June 3, 1971.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A14CE](https://openairdocs.org/tcds/A14CE): Textron Aviation Inc.; names 6 of 12 models: A99, A99A, C99, B99, 99A, 99

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 95 (95 by airframe model, 0 by engine model)
- Makers: Beech 95

Models with the most aircraft:

- [Beech C-99](https://openairdocs.org/model/beech-c-99): 54 aircraft (airframe model)
- [Beech 99](https://openairdocs.org/model/beech-99): 23 aircraft (airframe model)
- [Beech 99A](https://openairdocs.org/model/beech-99a): 11 aircraft (airframe model)
- [Beech B-99](https://openairdocs.org/model/beech-b-99): 6 aircraft (airframe model)
- [Beech A99](https://openairdocs.org/model/beech-a99): 1 aircraft (airframe model)

All 5 models: https://openairdocs.org/ad/70-10-01/models.md
Every aircraft: https://openairdocs.org/ad/70-10-01/aircraft.md

Its text cites no advisory circulars or STCs.

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